EGLMEIER, C and RANGE, KJ and KLEYNHANS, A and HEYNS, AM (1993) (NH4)2V4O11 AND NH4VO4 REVISITED - CRYSTAL-STRUCTURE AND INFRARED-SPECTRA OF AMMONIUM DECAVANADATE HEXAHYDRATE, (NH4)6V10O28.6H2O. SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE, 46 (1-2). pp. 7-13. ISSN 0379-4350,
Full text not available from this repository.Abstract
Upon several attempts to confirm earlier reports on the synthesis of (NH4)2V4O11 . 2-3H2O and NH4VO4, ammonium decavanadate hexahydrate, (NH4)6V10O28 . 6H2O, has invariably been obtained. Single crystals, suitable for an X-ray crystal structure analysis, could be grown from aqueous solutions. They are triclinic, space group P1BAR, with a = 10,162(3) angstrom, b = 10,294(4 angstrom, c = 16,733(7) angstrom, alpha = 83,46(3)-degrees, beta = 87,14(3)-degrees, gamma = 71,02(4)-degrees, and Z = 2. The structure was solved by direct methods and refined to R = 0,046 and wR = 0,051 for 4480 unique reflections with I > 3sigma(I). It comprises [V10O28]6- polyanions which are formed by distorted VO6 octahedra sharing edges. The V-V distances range from 3,052 to 3,181 angstrom and the V-O distances are between 1,597 and 2,315 angstrom. In addition to each polyanion, there are six ammonium ions and six water molecules. The infrared spectra have been recorded and tentative assignments of the water, ammonium, and decavanadate vibrations have been made. The infrared spectra during the decomposition of (NH4)6V10O28 . 6H2O are also presented. The N-H vibrations indicate the existence of strong hydrogen bonds in this decavanadate.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VIBRATIONAL-SPECTRA; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53949 |
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